Investigation of the Dynamic Pure-Mode-II Fracture Initiation and Propagation of Rock during Four-Point Bending Test Using Hybrid Finite–Discrete Element Method

A hybrid finite–discrete element method (FDEM) is proposed to investigate dynamic pure-mode-II fracture behaviors. The transition of continuum discontinuum was applied the FDEM through use three modes, so that whole process could be modeled naturally. then employed model behavior rock during a four-point bending test with prefabricated notch. results showed initiated from tip notch under relatively lower loading rate, i.e., 1 m/s and 5 m/s. However, when rate reached higher levels, 10 50 m/s, played small role in patterns. Under these conditions, center beam bottom or stress concentration vicinity, instead Regardless obtained force-loading displacement curves typical brittle material failure process. Additionally, by incorporating empirical correlation between static strengths tests, effectively reflect impact on strength rock. To conclude, an effective instrument initiation propagation rock, since it can both naturally simulate capture effect